PT1000

For precision temperature sensing, nothing beats a Platinum RTD. 

Resistance temperature detectors (RTDs) are temperature sensors that contain a resistor that changes resistance value as its temperature changes, basically a kind of thermistor. 

In this sensor, the resistor is a small strip of Platinum with a resistance of 1000 ohm at 0°C, thus the name PT1000. 

Compared to most NTC/PTC thermistors, the PT type of RTD is much most stable and precise (but also more expensive) PT1000's have been used to measure temperature in laboratory and industrial processes and have developed a reputation for accuracy (better than thermocouples), repeatability, and stability.